Coaster-brake.



W. s. GUBELMAN.

OOASTER BRAKE.

APPLICATION FILED APR. 6, 1907. RENEWED OCT. 9, 1913.

Patented July '7, 1914.

WILLIAM S. GUBELMAN, 0F BUFFALO, NEW YORK.

COASTER-BRAKE.

Specification of Letters Patent.

Patented July '7, 1914.

Application filed April 6, 1907, Serial No. 368,863. Renewed October 9, 1913. Serial No. 794,327.

and usefullmprovement in Coaster-Brakes, v

of which the following is a specification.

This invention relates to a coaster brake which is moreparticularly designed for use in bicycles but which may also be used for other purposes.

The object of this invention is the production of a brake and clutch for this ur-v pose which are'very efficient and reliab e in operation, which can be produced at comparatively low cost, which are so constructed that the wear on the parts is reduced to .a' minimum and which are not liable to slip or become inoperative by reason of excessive oiling of the parts.

In the accompanying drawings: Figure 1 is a longitudinal section of a bicycle hub equipped with my improved coaster brake. Figs. 2, 3 and 4; are transverse sections of the same taken in the correspondingly num- Fig. 5 is a fragmentary sectional view of the hub barrel detached from the rest of the parts. Figs. 6,

7 8 and 9 are detached perspective views of some parts of the brake and clutch. Fig.

10 is a detached side elevation of one form of the driven sleeve forming part of the brake and clutch. Fig. 11 is a perspective view of the friction ring forming part of the brake, shown in Figs. 1, 3 and 10. Fig. 12 represents a fragmentary sectional view of a modified form of the driven sleeve of the brake and clutch. Fig. 13 is a side elevation showing another modification in the form of the driven sleeve.

Similar letters of reference indicate corresponding parts throughout the several views. r

A represents the axle of the wheel which is secured to the fork or frame members a, so as to be held against turning, the means for this purpose shown in the drawings consistin of ball cones B, B screwed on the threaded-end ortions of the axle and engaging with t e inner sides of the frame members and-screw nuts 6, I) applied to the outer ends of the axle and engaging with the outer sideslof the fork members.

C represents the main hub barrel which. rotates concentrically about the axle and is provided near opposite ends with external annular flanges c to which the spokes ofthe wheel are secured in any suitable man-- ner. One endof this barrel, preferably the left end, as shown in the drawings, is journaled by means of an annular row of balls D interposed between the stationary left cone B and a race-way or cone d formed in this end ofthe hub barrel. The cone D is positivelk held against' turning by means of an arm secured at one end-1n any suitable manner to the adjacent frame member while its opposite end is provided with a flat sided opening which receives a correspondingly shaped boss e on the outer side of the ball cone B. At the opposite end of the hub barrel the same is ournaled by means of an interposed row of balls f on a driving sleeve H w ich rotates about the axle. This driving sleeve is in turn journaled upon the adjacent right end cone B by means of a row of balls interposed between said cone and a race-way on the driving sleeve. The

latter may be rotated by any suitable means,

for instance, by means of a drivmgmechaing sleeve and are coupled so as to be compelled to rotate together but are .free to move axially one relatively to the other by means of interlocking lugs k, 74 arranged on the opposing ends of the driven sleeve sections. The inner section K of this pair of sleeve sections is provided. in its bore with an internal screw thread 1 forming. practically a screw nut and this thread engages with an external screw thread'l formed on the inner end of the'driving sleeve which latter is equivalent to-a screw bolt.

,The periphery m of the outer section' of the driven sleeve. is made conical and outwardly tapering and is adapted to engage" with a correspondingly tapering face m formed in the bore of the hub barrel adthe driven sleeve to be moved axially out-v ward or toward the right and thereby cause barrel until the action of the screw threads- -'acent to the inner side of the right hand all bearing thereof. These conical faces of the driven sleeve and-hub barrel form the gripping faces of a clutch whereby the hub arrel and driving mechanism may be connected and disconnected. The threads of the driving sleeve and the driven sleeve trend in the proper directions so that when 10 the driving sleeve is turned forwardly by means of power applied .to the s rocket wheel, the action of 1: ese threads wi 1 cause the conical gripping or clutch face of the driven sleeve to engage withthe companion face of the hub barrel and produce a driving connection between these parts, whereby the.

forward rotation of the driving sleeve is transmitted to the hub barrel for rotating it in the same direction. Upon turning the driving sleeve backwardly or holding the same against turningwhile the hub barrel continues to rotate. forwardly,'the driven sleeve will continue to rotate with the hub between the driving and driven sleeves has moved the latter axially inward or toward the left sufficiently to opera'tively disengagethe clutch face of the driven sleeve from that of the hub barrel. Thereafter the hub barrel will rotate-independently of the driven sleeve and in the position of the arts the l wheel is free to be .turnedin either irection.

It has been found in practice that bicycle riders are apt to oil the mechanism on. the interior of the hub' barrel excessively when any difficulty is experiencedregardless of whether, the difficulty is due to lack of oil or other cause. This'excessive oiling produces a film of oilupon the opposing clutch faces .of the driven sleeve and hub barrel which prevent the same from gripping each other reliably and thus causes: slippage between these parts and interference with the roper transmission of power to the hub arrel.

To overcome this difficulty and prevent ex-- cessive deposit of oil on the opposing clutch faces, each of these faces is scored or otherwise constructed'of irregular form so astoproduce a plurality of elevated and depressed face ortions. By this means. any oil which is eposited upon these faces is squeezed off from the high face portions.

when'the two clutch faces come together and caused to run down .into the depressed portions of these faces; By this means a drainage is provided which permits the excess oil to be readily dis laced from the high oro erative; parts 0 the clutch faces and ena les them to reliably and firmly engageeach other so as to permit of properly transmitting the power from the driving device to thehub barrel. This irregular formation of these clutch faces may be produced in i of the hu various ways, for instance, as shown in Figs. 5 and 10, the face of the barrel hub may be provided with alternating longitudinal ribs and grooves 92, n? and the clutch face of the driven sleeve may be provided with alternatin ribs and 4 rooves a a which. are arranged'at an anglerelatively to those of the hub barrel. By thus arranging the ribs and .grooves of the hub barrel and driven sleeve at an angle to each other, the same only engage each other frictionally on their highest faces but do not positively interlock, thereby permitting these parts. to slip upon *each'other until. suflicient pressure is applied panded for engaging their peripheries with the bore of the hub barrel or contracted for disengaging their peripheries therefrom. As shown in Fig. 1, two of such split brake shoes or sleeves are shown but a greater numbermay be employed if desired. On

their opposing ends these brake sleeves are provided with wedges or V shaped extensions P,P each of which projects lengthwise from it brake sleeve toward the other brake sleeve and into the slit thereof and engages with correspondingly inclined faces .7) formed on opposite edges of the slit. Upon moving these brake sleeves axially or lengthwise one relatively to the other, the action of their cooperating wedges and inclined faces causes the sleevestobe expanded and bear with their peripheries against the bore of the hub'barrel. Upon moving these brake sleeves axially away from each other,

their wedges are withdrawn from their slits,

permitting the same to'contract and with draw their peripheries from the hereof the hub barrel. When the hub barrel isthus engaged by the. brake sleeves the rotation -of the latter is retarded or wholl arrested but when the brake sleeves are isengaged from the hub'barrel, the latter is free to rohate in either direction. In order to render these brake shoes effective, they must be held against rotation and this is done by the brake sleeve at the left end with a stationary part, the preferred means for this purpose shown inthe connecting drawings consisting in forming an annular same with a similar row of teeth or lugs Q formed on the periphery of the left ball cone B inwardly from its ball raceway.v

Between the bore of the right member of the pair ofsplit brake sleeves and the periphery of the driven sleeve is arranged'an row of teeth or lugs g at the outer end of the left brake sleeve and interlocking the abutment sleeve R which may be frictionally connected with or disconnected from the driven sleeve but is positively connected with the right brake sleeve. The frictional connection is preferably produced by constructing the abutment sleeve so sleeve by means of an annular row of teeth or lugs .9 arranged at the outer end of the abutment sleeve and interlocking with similar teeth or lugs s on the outer end of the right brake sleeve. Upon turning the driving sleeve backwardly, the driven sleeve will be moved axially inward by the act-ion of the screw threads between the same, the driven sleeve being held against turning at this time by thefrictional contact between the same and the abutment sleeve. The grip between these parts is increased by the tapering form of their cooperating surfaces. As the driven sleeve moves axially inward it carries the abutment sleeve and righthand brake sleeve in the same direction, thereby causing the respective wedges of both brake sleeves to spread the same into engagement with the hub barrel'and retard or arrest the rotation of-the latter. 'Upon turning the driving sleeve forwardly the driven sleeve owing to its frictional connection with the abutment sleeve is held against turning, thus enabling the threads between the driving and driven sleeves to move the latter axially outward and permit the brake sleeves to separate and contract out of engagement with the bore of the hub barrel.

Frictional contact between the driven sleeve and abutment sleeve is required for obtaining the'braking effect but during the ordinary rotation of the hub barrel this fric tion should be eliminated so as not to interfere with the rotation of the hub barrel and driving mechanism and .also to avoid unnecessary wear on the parts. When the driven sleeve is depended upon solely to produce a frictional connection between the same and the abutment sleeve, the application of the brake and clutch is not always prompt owing to the liability of slippage of the driven sleeve before a'firm grip between the same and the abutment sleeve is effected.

In order to enable the brake and clutch to be applied promptly, the following retardders t on the opposing edges of the driven sleeve sections. The split retarding ring is caused to turn with said sleeve sections by a radial pin a connected at its outer end with the spring ring while its inner end engages with a recess u formed in the opposing sides of two of the cooperating lugs of said sleeve sections, as shown in Figs. 3, 10 and 11. While the driven sleeve is moved inwardly into engagement with the abutment sleeve the sections of the driven sleeve separate and only the inner member thereof is operative during the application of the brake:

while the outer section is released from the hub barrel. During this separated condition of the driven sleeve sections the split ring is free to expand and bears against the bore of the abutment sleeve and operates to pro duce a frictional coupling between the driven and abutment sleeves. Upon turning the driving sleeve forwardly, the gripping of the split ring against the abutment sleeve prevents rotation of the driven sleeve sections-until the same have been moved outwardly sufficiently to properly engage the clutch face of the outer member with that of the hub-barrel. During the continued forward movement of the driving sleeve the inner member of the driven sleeve sections spring retarding ring is contracted out of I engagement with the abutment sleeve by the action of the cooperating beveled faces on the driven sleeve sections and the spring ring, thereby avoiding all contact at this time between moving and stationary parts. During the first part'of the backward movement of the driving sleeve only the inner member of the sectional driving sleeve is moved inwardly axially, this bein possible owing to the coupled condition of t e clutch. As the two members of the driven sleeve separate, the split spring between the same is released and permitted to expand into engagement with the abutment sleeve and the grip of the outer sect-ion on the hub barrel is released, so as to uncouple the last-mentioned parts. The grip of the split spring on the abutment sleeve is suflicient to prevent the driven sleeve sections from turning, thereby insuring a quick inward movement of the inner driven sleeve section and a prompt application of the brake.

Instead of constructing the driven sleeve in sections, as shown in Figs. 1 and 1,0, the same may be constructed in one piece, as shown at K K in Fig. 12. When the driven sleeve is constructed in one piece, the split spring T is arranged in an annular groove 25 in the driven sleeve and is connected therewith so as to be always operative for causing prompt engagement and disengagenient of the driven sleeve with the abut-' ment sleeve but the objectionable wear on the parts and the resistance to the-power applied is still present.

- .In the mod'fied construction shown in Fig. 13, the supplemental friction for hold-v ing the driven sleeve against turning while applying either the brake or the clutch is produced-by mounting the outer member K of the pair of driven sleevesections on a tubular neck of the innerse'ctionKf and cansing the same to turn together by radial ins w arranged on the neck of the inner sec- -ti0n and engaging with openings to in the outer section. The latter is provided'with two sets of slots w, 21 arranged parallel with p the axisof the section, the slots of the two sleeves, substantially as set forth. 2. The combination of a' hub barrel, a

driving lceve, a clutch device interposed between said driving sleeve and hub/barrel,

sets alternatingwith each other and each slot extending from one edge of the section partway toward'the opposite edge thereof,

thereby enabling this section to expand and contract. As the outer member of the driven sleeve is drawn with its conical face into the conical face of the hub barrel, said member is contracted, thereby withdrawing its periphery from the bore of the abutment sleeve'and avoiding the resistance of the abutment .sleeve. When said member is moved inwardly out of engagement with the hubbarrel, the same expands and engagesthe bore of the abutment sleeve and couples the driven sleeve frictionally with the abutment sleeve so as to retard or hold the driven-sleeve against turning and enable the. brake to be. applied promptly.

I claim as my invention:

1. The combination of a barrel, two split brake sleeves arranged in said barrel and each provided with-a wedge enteringthe slit'of the other, means for'holdingsaid' sleeves against turning, and means for causing relatlve longltudmal movement of said and a brake comprisng two split sleevesarranged in said hub barrel, wedges arranged on the opposing ends o'fsa'id brake sleeves and each entering the slit of the other sleeve, means for holding said brake'sleeves against turning, and means for moving said brake sleeves one lengthwlse relatively to "the other by motion from the driving sleeve,

substantially at set forth. 4

3; The combination of a hub barrel, a

4 driving sleeve, a clutch device interposed between said driving sleeveand hub barrel, and a brake comprising two split sleeves arranged in said hub barrel, Wedges arranged-on the opposing ends of said brake sleeves and each entering the slit of the other sleeve, an axle arranged within the brake-sleeves, means for holding said brakesleeves against turningconsisting of teeth arranged on' one of said brake sleeves, and a toothed member secured to the axle and-having teeth interlocking with the teeth of said brake sleeves, and means for moving the other brake sleeve lengthwise by movement derived from'the driving sleeve, substantially asset forth.

4. The combination I of a hub barrel, 9. driving sleeve, a clutch device interposed between said driving sleeve and hub barrel, and a brake comprising two split sleeves ar-' ranged in said hub barrel, wedges arranged on the "opposing ends of said brake sleeves and each entering the slit of the other sleeve, an axle arran ed within the brake sleeves, 'means for hol in g said brake sleeves against turning consisting of teeth arranged on one pf said brake sleeves, and a bearing ,cone for said barrel secured to the axle and provided with teeth which interlock with the teeth of said brake sleeve, substantially as set forth..

' 5.- The combination of a hub barrel, a driv ing sleeve, a clutch device interposed between said driving sleeve and hub barrel, and a brake comprising two split sleeves arranged in said hub barrel, wedges arranged on the opposing ends of said brake sleeves and each entering the slit of the other sleeve, a axle arranged within the brake sleeves, 'means for holding said brake sleeve against turning consisting of teetharranged on one of said brake sleeves, and a toothed member secured to the axle and having teeth interlocking with the teeth of one of said brake sleeves,

*a conical abutment sleeve having teeth which interlock with teeth on the other brake sleeve, a conical driven sleeve engaging with said abutment sleeve, and a driving Sleeve having a screw connection with said driven-sleeve, substantially as set forth.

6. The combination of a hub barrel, a

pair of split brake sleeves which are-held against turning in said barrel and each of.

which is provided with a wedge which enters the slit in-the other, an abutment sleeve having an annular row of ln s which inter--- lock with a similar row of ugs on one of the brake sleeves, a driven sleeve engaging -wi'th the abutment sleeve, and a driving sleeve having a screw connectlon with said driven sleeve, substantially as set forth.

8. The combination of a hub barrel, a pair of split brake sleeves which are held against'turning in said barrel and each of which is provided with a wedge which enters the slit in the other, an abutment sleeve having a conical bearing face and provided with an annular: row of teeth which lnterlock with a similar row of teeth on one of said brake sleeves, a driven sleeve having; a conlcal bearing face which engages w 1th' that of the abutment sleeve, and a drlving' sleeve having a screw connection with said driven sleeve, substantiallyas set forth.

, 9. The combination of a hub barrel having a conical clutch face provided with longitudinal alternating ribs and grooves, a driven non-rotary part and provided with a brake face adapted to engage with said brake face of the hub and provided with a clutch face,

a driving member, driven means having a driving clutch face adapted to engage said driven clutch face of the hub and also'having a clutch face adapted'to engage with the clutch face of said operable brake mem her, a retarding device which normally forms a connection between said driven member and said non-rotary part, and

' member, means for coupling said sections means for disengaging said retarding device from said non-rotary partwhen said driving member operates to propel said driven member.

- 11. The combination of a hub barrel, a brake member arranged within the hub barrel, a driven member composed of two sections one of which is adapted to engage with said barrel and the other with said brake but permitting longitudinal movement of the same relatively to each other, a driving member having a screwconnection with that section of the driven member which engages the brake member, and a retarding device frictionally coupling and uncoupling said driven member and brake member and operated by the longitudinal movement of said driven member sections, substantially as set 1 forth.

12. The combination of a hub barrel provided with a clutch face, a brake member arranged within the hub barrel, a driven member adapted to actuate said brake member and having .a clutch face adapted to engagethat of the hub barrel, a driving member having a screw connection with said driven member, and a split spring ring connected with the driven member and frie tionally engaging said brake member, said driven member comprising a pair of driven sections whereby said split ring is contracted out of engagement from said brake member upon moving said driven sections toward each other and whereby said split ring is expanded intoengagement with said brake member upon moving said driven sections away from each other, substantially as set fo e 13. The combination of a hub 'barrel having a clutch face, a brake member arranged withinthe hub barrel, a driven sleeve com-- posed of two sections which areadaptedto operatively engage with the brake member and the. hub barrel respectively, a drivin sleeve having a screw connection with sai driven sleeve, and a split spring ring connect-. Y

1 ed withsaid driven sleeve and adapted to engage said brakemember, said driven sleeve sections when moved toward each other operating to contract said split rin out of engagement from said brake mem er and when movedaway from each other to'per mit said ring to expandinto engagement with said-brake member, substantially as,

Set forth.

'14; The combination of a hubbarrel having aclfutch face, a brake member arranged within the hub barrel, ajdriven-sleeve com posed of two sections which are adapted to.

operativ'ely engage with the "brake member and the hub barrel, respectively, and which are loosely connected, a dr1v1ng sleeve having a screw connection with said driven sleeve, and a split spring ring connected with said driven sleeve and adapted to engage said brake member and having a beveled edge'which engages with a corresponding edge on a section of the. driven sleeve, substantially as set forth.

1,5. The combination of a hub barrel having a clutch face, a brake member arranged within the hub barrel,'a driven. sleeve composed of two sections which are adapted to op'eratively engage with the brake member and the hub.barrel,, respectively and which are loosely connected by means of interlockinglugs on the opposing end of said sections, a driving sleeve having a screw 'connectionwith said driven sleeve, and a split spring ringconnected with said driven sleeve and adapted to engage said brake :member' and having its opposite edges beveled and engaging with correspondingly beveled edges on the sections of the driven sleeve, substantially as set forth.

16. The combination of a, hub barrel having a clutchface, a pair of split brake sleeves two sections one of which is adapted to en gage said clutch face and the other with said abutment sleeve, interlocking lugs arranged on said driven sleeve sections, a split sprlng ring adapted to engage its periphery with the bore of the abutment sleeve and having its opposite edges beveled and engagin with correspondingly beveled edges on the riven sleeve sections, a pin connecting said spring 7 with said lugs, anda driving sleeve having Witness my hand this 21st day of March, 1907 WILLIAM s. GUBELMAN. Witnesses: i

THEO. L. POPP, E. M. GRAHAM. 

